Ok, what I mean is, the tank comes with this lighting: 2 x 30" 25 watt T8 bulbs, 1 x 23.5" 20 watt T8 bulb. I'm just starting out with a planted tank, are these lights adequate for plant growth and if not what should I replace them with? One of the bukbs has a distinctly purple light, does this have a purpose or is it just cosmetic, my fish seem to like it!! Hope this makes things clearer.